Mark W.

API Technical Writer: Open banking | Payments Processing | Trading

I am an API Documentation Specialist for FinTech, including payment processors and investment management. As an Expert-Vetted freelancer on Upwork, I rank in the top 1% of technical writers. I’ve appeared on podcasts like Knowledge Base Ninjas (see video in profile) and collaborate with industry leaders like Scott Abel to train tech writers. I help companies transform their API documentation into the definitive "single source of truth" while translating complex API workflows into clear, actionable user guides that bridge the gap between business processes and technical execution. What I Offer: * FinTech Expertise: In-depth knowledge of payment processors and investment management. * API Docs Beyond Swagger: Expert in charting API flows and documenting sequences that mirror business processes. * AI-Equipped Documentation: Ensuring content is semantically rich and queryable for advanced retrieval needs like knowledge graphs. * OpenAPI Design & Testing: Extensive experience in API design, testing, and documentation that aligns with modern development practices. * Proven Training Success: Developed and delivered a profitable API documentation course, grossing over $20k independently, covering both technical and instructional content. Deliverables I Can Provide or Create for You: - Comprehensive user guides and product manuals - Detailed API documentation - Clear SDK documentation - Developer guides and tutorials - Training material on technical topics - Informative knowledge base articles - Well-structured style guides My API documentation process includes: - Analyzing the OpenAPI spec and existing guides to understand the API's business domain. - Diagramming domain models to capture key entities and relationships. - Testing the API in a sandbox environment to ensure accuracy. - Exploring API flows and user journeys (e.g., UI interactions where applicable). - Revamping API references by thoroughly testing examples and addressing deviations. Tools and Technologies I Excel In: - Programming frameworks: Node.js, React, PostgreSQL, SQL, and Python basics - Docs-as-code tools/formats: Markdown, Visual Studio Code, and Git - API Design & Testing Tools: Swagger Editor, Postman, and cURL - API Documentation Tools: Redocly, Stoplight, ReadMe, and Gatsby - Project Management & Collaboration: JIRA, Confluence, Slack, GitHub Book a Consultation: You can schedule a consultation with me by clicking the "Book a consultation" button. For a detailed overview of my process and how we can work together. I've also attached my general "Consultation process.pdf" as a template for how the engagement can get started. Flexible Engagement Across Borders: I’m a global freelancer collaborating with clients from various countries. I offer flexible meeting times to accommodate your schedule and ensure our discussions are convenient for you. Additionally, I excel at asynchronous communication, providing clients with regular visibility and progress updates through written reports between meetings. This approach fosters effective collaboration and keeps everyone informed.